Hilariously, everything which can go wrong in a production does so.

Il Fornicazione is a "grim" tale of operatic adultery, poison and mayhem.
Streuth is the crime story Agatha Christie would never have dared to write.
A Collier's Tuesday Tea combines the kitchen with the coal min with an irreverent glance at D.H. Lawrence.
All's Well that Ends As You Like It pushes the genius of the bard to its limits while filching lines from most of his plays.

In all, cues are missed, effects fail, props are lost and confusion reigns, but the coarse actors struggle on.